Controlling mechanism



I C. W. WYMAN CONTROLLING MECHANISM June 25, 1929.

Original Filed March 24, 1924 MAW:

Patented June 25, 1929.

UNITED STATES PATENT OFFICE.

CHARLES W. WYMAN, G]? CLABIIMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVANMACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

CONTROLLING MECHANISM.

Original application filed March 24, 1924, Serial No. 701,594. Dividedand this application filed December 27', 1927. Serial No. 242,716.

This invention relates to controlling mechanisms, and more particularlyto a check for the controller whereby the movement of the operatinghandle is limited. This application is a. division of my copendingapplication Ser. No. 701,594, filed March 24, 1924 for controllingmechanisms. The type of electric controller disclosed in said copendingapplication particularly adapted, although not exclusively, to be usedin a mining machine.

Among the objects of the present invention the provision of improvedmeans for insuring the correct operation of an electric controller. Afurther object is to provide an improved manual means for insuring theproper operation of the operating handle of an electric controller. Afurther object is to provide an improved check for use in connectionwith a reversible type of electric controller. A still further object isto provide improved means to prevent the operating handle from beingswung directly from the forward position to the reverse position. Otherobjects and advantages of the invention will subsequently appear.

In the accompanying drawings in which, for purposes of illustration, oneembodiment which the invention may assume in practice is shown:

Fig. 1 is an elevational view of the controller handle together with themanual means for limiting movement thereof.

Fig. 2 is a vertical transverse sectional view taken through a portionof an electric controller of the drum type, my improved manual checkbeing provided to cooperate with its operating handle.

Fig. 3 is a detail view of the controller check.

My copending application discloses an improved electric controllercarricd within a. recess in av mining machine. A bearing member 3 isshown carried by a vertical plate 5, which is suitably secured to themining machine. The drum 7 is rotatably mounted within the bearingmember 3 as by a shaft 8. This shaft extends through the drum 7 and issupported by a second bearing member (not shown) at its lower end,similar to bearing member 3, and likewise carried by the vertical plate5. Beveled gear segment 9 is fixed to the shaft 8 adjacent the bearingmember 8, and an actuating gear segment 10 meshes therewith. The

gear segment 10 is fixed to a shaft 11 rotatably carried by a cover 12,which is in turn fixed to the mining machine by bolts Fixed to the shaft11 is an actuating handle 14 whereby the gear segments may beoscillated.

Suitable means are provided for preventing continuous movement of thishandle so to rotate the drum 7 from one extreme position to the oppositeextreme position. It is well known that to quickly reverse the currentfrom full forward to full reverse is an abuse of the motor. The checkmeans which I have herein described is adapted to temporarily halttheswing of the controller handle 14 at such position as to completelyinterrupt the current. This check cooperates with an arm 15 extendingupwardly from the handle 14. The arm 15 carries a. pin 16 which projectsfrom the back side thereof. My improved check comprises a member 18which is pivoted about a pin 19, the latter being in axial alinementwith the pin 16 when arm 14 is in neutral position. The member 18 isprovided with fingers 17 forming a U slot into which the pin 16 projectswhen arm 14 is in its neutral position. It will be seen from Fig. 2 thatlugs 20 extend downwardly and upwardly from the member 18 in a plane tothe rear of the fingers 17 and are provided for the purpose of engaginga stop pin 21. A grasping portion 22 pro ects from the body portion ofthe member 18.

In describing the operation of my improved device, let it be assumedthat the controller handle 14 is infull forwardposition. \Vhen theoperator desires to completely reverse the current, the controllerhandle 14 is moved until further movement is stopped by the engagementof pin 16 in the U slot formed by fingers 17. The controller handle 14is now in neutral position and no current is passing through thecontroller. The operator thereupon grasps portion 22 and moves themember 18 to its opposite position. The controller handle 14 is now freeto rotate the drum 7 so as to direct current to the motor in a reversedirection. It will be noted that when the operator desires to move thecontroller handle 14 from a given reverse position to any given forwardposition, the handle 14 is permitted to move only to neutral positionwhere the pin 16 engages the U slot formed by fingers 17. The operatormust now reverse the position of member 18 before the handle 14 is freeto move to the desired for- .ward position.

It is thus apparent that my improved clevice very effectively preventsmovement of the controller handle from forward position toreversepositionbyacontinuousmovement. It also prevents movement from areverse position to a forward position by continuous movement. The shortinterval during which the handle 14 must remain in neutral positioninsures the safety of the motor from abuse due to sudden reversal of thecurrent.

lVhile I have in this application specifically described one form whichmy invention may assume in practice, it will be understood that thistorin ot' the same is used for purposes of illustration and that theinvention may be modified and embodied in various other forms withoutdeparting from its spirit or the scope of the appended claims.

-W'l1at I claim as new and desire to secure by Letters Patent is:

r 1. In a motor reverse control, the combination with a controllerleveradapted to swing in either direction from a central position, of apivot-ed check member having a recess coaxial with its pivot, and anopening extending radially out of said recess.

2. In a motor reverse control, the combination with a controller leveradapted to swing in either direction from a central position and havinga projection, of a member pivoted coaxially with said projection whenthe latter is in central position, said member having a recess coaxialwith its pivot and an opening extending radially out of said recess.

8. In a motor reverse control, the combination with a controller leveradapted to swing in either direction from a central position and havinga projection, of a check member having a lateral recess adapted toreceive said projection, said check member being pivotally mounted atthe central position to obstruct the movement of said projection so thatthe projection can not pass the central position without pivotalmovement of the check member with the projection disposed in saidrecess.

l. In a motor reverse control, the combination with a controller leveradapted to swing in either direction from a central position and havinga proj ection, of a check member pivoted on an axis passing through saidprojection when at its central position, said check member afiording arecess having a portion disposed on said axis of pivoting and adapted toreceive said projection.

5. In a motor reverse control, the combination with a controller leveradapted to swing in either direction from a central position and havinga projection, of a check member having a lateral U-shaped recess adaptedto receive said projection, said check member being pivotally mounted onan axis passing through said projection when at its central position,the bottom of said recess being disposed on said axis.

6. In a motor reverse control, the combination with a manual operatingmember for the control adapted to move in either direction from acentral position, said operating member having a projection, of a singlepivoted check member movable into one position to obstruct movement ofsaid manual operating member in one direction from said central positionand movable into an opposite position to obstruct movement of saidmanual operating member in the opposite directi on from said centralposition, said check member having a recess adapted to receive saidprojection and to contain the same during movement of said check memberfrom one of said positions to the other.

7. In a motor reverse control, the combination with a manual operatingmember for the control having a projection, said manual operating memberbeing mounted for movement in either direction from a central position,of a check member-having a single recess into which said projection isadapted to project, said check member cooperating with said projectionwhen the latter is in central position and being pivotally mounted toreceive the centrally positioned projection into said recess When in oneposition and movable into an opposite position to free said projectionfor movement on past said central position.

In testimony whereof I aflix my signa ture.

CHARLES VVYMAN.

